Dave loves his cave. But what if there's a better cave out there, with greener grass and bigger rocks? Dave loves his cave. The inside is decorated exactly the way he likes it. There's a spot for a fire and the grass is always green. But what if there's a better cave out there, with greener grass and bigger rocks? Dave needs to find out for himself. But it turns out that good caves are hard to find--they're either too noisy, or too spare, or too crowded,...